Skip processing of properties keyword if not an object

src/main/java/com/networknt/schema/keyword/PropertiesValidator.java

@@ -57,13 +57,17 @@ public PropertiesValidator(SchemaLocation schemaLocation, JsonNode schemaNode, S
     @Override
     public void validate(ExecutionContext executionContext, JsonNode node, JsonNode rootNode,
             NodePath instanceLocation) {
+        if (!node.isObject()) {
+            // ignore if not object
+            return;
+        }
         validate(executionContext, node, rootNode, instanceLocation, false);
     }
 
     protected void validate(ExecutionContext executionContext, JsonNode node, JsonNode rootNode,
             NodePath instanceLocation, boolean walk) {
         Set<String> matchedInstancePropertyNames = null;
-        boolean collectAnnotations =  hasUnevaluatedPropertiesInEvaluationPath(executionContext) || collectAnnotations(executionContext);
+        boolean collectAnnotations = hasUnevaluatedPropertiesInEvaluationPath(executionContext) || collectAnnotations(executionContext);
         for (Entry<String, Schema> entry : this.schemas.entrySet()) {
             JsonNode propertyNode = node.get(entry.getKey());
             if (propertyNode != null) {

src/test/java/com/networknt/schema/keyword/PropertiesValidatorTest.java

@@ -4,6 +4,7 @@
 import com.networknt.schema.BaseJsonSchemaValidatorTest;
 import com.networknt.schema.Error;
 import com.networknt.schema.InputFormat;
+import com.networknt.schema.OutputFormat;
 import com.networknt.schema.Result;
 import com.networknt.schema.Schema;
 import com.networknt.schema.SchemaRegistry;
@@ -120,4 +121,26 @@ public void onWalkEnd(WalkEvent walkEvent, List<Error> errors) {
         assertEquals("#/additionalProperties/type", errors.get(1).getSchemaLocation().toString());
         assertEquals("type", errors.get(1).getKeyword());
     }
+
+    @Test
+    void shouldNotProcessIfNotObject() {
+        SchemaRegistry schemaRegistry = SchemaRegistry.withDialect(Dialects.getDraft202012());
+        String schemaData = "{\n"
+                + "  \"properties\": {\n"
+                + "    \"productId\": {\n"
+                + "      \"type\": \"integer\",\n"
+                + "      \"minimum\": 1\n"
+                + "    }\n"
+                + "  },\n"
+                + "  \"additionalProperties\": {\n"
+                + "    \"type\": \"integer\"\n"
+                + "  },\n"
+                + "  \"unevaluatedProperties\": false\n"
+                + "}";
+        String instanceData = "\"hello\"";
+        Schema schema = schemaRegistry.getSchema(schemaData, InputFormat.JSON);
+        Result result = schema.validate(instanceData, InputFormat.JSON, OutputFormat.RESULT);
+        assertEquals(true, result.getErrors().isEmpty());
+        assertEquals(0, result.getExecutionContext().getAnnotations().asMap().size());
+    }
 }